CN112534631B - Power supply device and vehicle having the same - Google Patents

Power supply device and vehicle having the same Download PDF

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Publication number
CN112534631B
CN112534631B CN201980051360.5A CN201980051360A CN112534631B CN 112534631 B CN112534631 B CN 112534631B CN 201980051360 A CN201980051360 A CN 201980051360A CN 112534631 B CN112534631 B CN 112534631B
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China
Prior art keywords
secondary battery
power supply
supply device
separator
battery cell
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CN201980051360.5A
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Chinese (zh)
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CN112534631A (en
Inventor
山城豪
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Sanyo Electric Co Ltd
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Sanyo Electric Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • B60L50/64—Constructional details of batteries specially adapted for electric vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/155—Lids or covers characterised by the material
    • H01M50/157—Inorganic material
    • H01M50/159—Metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/242—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries against vibrations, collision impact or swelling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/262—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks
    • H01M50/264—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks for cells or batteries, e.g. straps, tie rods or peripheral frames
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
    • H01M50/291—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs characterised by their shape
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Sustainable Energy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Battery Mounting, Suspending (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

In order to protect the secondary battery cells from the stress when the secondary battery cells swell, the power supply device (100) has a plurality of secondary battery cells (1) having one open end of a rectangular outer can (1 a) closed by a sealing plate (1 b), an insulating separator (40) interposed between adjacent secondary battery cells (1), a pair of end plates (20) covering both end faces of a battery stack (10) formed by stacking the plurality of secondary battery cells (1), and a plurality of fastening members (30) fastening the end plates (20) to each other. In the power supply device (100), the region on the sealing plate (1 b) side in the region where the separator (40) is in contact with the secondary battery cell (1) is less likely to deform than the other regions. Thus, the part of the separator (40) that contacts the sealing plate (1 b) side is not easily deformed, so that the connecting part between the sealing plate (1 b) and the outer can (1 a) is protected when the secondary battery cell (1) expands, and the deformation of the outer can (1 a) is allowed in the other part, so that the deformation during expansion can be alleviated.

Description

Power supply device and vehicle having the same
Technical Field
The present invention relates to a power supply device and a vehicle having the same.
Background
The power supply device is used for a power supply device for driving a vehicle, a power supply device for storing electricity, and the like. As such a power supply device, fig. 16 shows a perspective view of a conventional power supply device 900, and fig. 17 shows an exploded perspective view thereof. As shown in the drawing, a plurality of secondary battery cells 901 are stacked with separators 940 interposed therebetween to form a battery stack 910, and are fixed by a tie bar 930 in a state of being pressed from both surfaces by end plates 920. The separator 940 in fig. 17 is formed in a flat plate shape having a size that covers the entire surface of the secondary battery cell 901, as shown in the perspective view of fig. 18, and is sandwiched between the adjacent secondary battery cells 901 to insulate them.
On the other hand, the secondary battery cell expands and contracts when charge and discharge are repeated. In particular, with the recent demand for higher capacity, the capacity of the single secondary battery cell has been increased, and as a result, the amount of expansion also tends to increase. In the power supply device having the above-described configuration, the expansion of the secondary battery cells constituting the battery stack is suppressed by the end plates 920 and the tightening bars 930, and a large load is applied to the tightening bars and the end plates.
Therefore, in order to reduce the load applied to the binding bar and the end plate, as shown in fig. 19, a structure is proposed in which the center of the spacer 940' is recessed. This spacer 940' absorbs the bulge during expansion by the recess 941 at the center of the spacer, thereby reducing the load applied to the binding strips and the end plates during expansion.
Documents of the prior art
Patent document
Patent document 1: japanese patent No. 6073583
Disclosure of Invention
Problems to be solved by the invention
As described above, according to the structure of patent document 1, the load applied to the tightening strip and the end plate during expansion can be reduced, but the effect is limited. Considering the recent situation in which the amount of expansion increases with an increase in the capacity of the secondary battery cell, the effect of reducing the load applied to the binding bars and the end plates during expansion may be insufficient.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a power supply device and a vehicle including the power supply device, which can reduce a load applied to a binding bar and an end plate during expansion, as compared with a conventional configuration.
ForMeans for solving the problems
A power supply device according to one aspect of the present invention includes a plurality of secondary battery cells in which an open end of a rectangular outer can having an opening on one side is closed by a sealing plate, an insulating separator interposed between adjacent secondary battery cells, a pair of end plates covering both end surfaces of a battery stack formed by stacking the plurality of secondary battery cells, and a plurality of fastening members fastening the end plates to each other. In the power supply device, in a region where the separator is in contact with the secondary battery cell, a region on the sealing plate side is less likely to be deformed than other regions.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the above configuration, the portion of the separator that contacts the sealing plate side is less likely to deform, so that the connecting portion between the sealing plate and the outer can is protected when the secondary battery cell expands, and deformation of the outer can is allowed in other portions, so that deformation during expansion can be alleviated.
Drawings
Fig. 1 is a perspective view showing a power supply device according to embodiment 1.
Fig. 2 is an exploded perspective view of the power supply device of fig. 1.
Fig. 3 is a schematic vertical sectional view at the line III-III of the power supply apparatus of fig. 1.
Fig. 4 is a perspective view showing the separator of fig. 2.
Fig. 5 is a schematic horizontal cross-sectional view showing a state after the secondary battery cell has expanded at a V-V line of the power supply device of fig. 1.
Fig. 6 is a perspective view showing a partition plate of a power supply device according to embodiment 2.
Fig. 7 is a perspective view showing a separator of a power supply device according to embodiment 3.
Fig. 8 is a perspective view showing a separator of a power supply device according to embodiment 4.
Fig. 9 is a perspective view showing a partition plate of a power supply device according to embodiment 5.
Fig. 10A is a vertical sectional view of a main portion of a power supply device according to embodiment 6, and fig. 10B is a vertical sectional view of a main portion showing a state after swelling of the secondary battery cell of fig. 10A.
Fig. 11 is an exploded perspective view showing a separator of a power supply device according to embodiment 7.
Fig. 12 is an exploded perspective view showing a secondary battery cell of the power supply device of embodiment 8.
Fig. 13 is a block diagram showing an example of a power supply device mounted on a hybrid vehicle that travels via an engine and a motor.
Fig. 14 is a block diagram showing an example of a power supply device mounted on an electric vehicle that travels only by a motor.
Fig. 15 is a block diagram showing an example of a power supply device applied to power storage.
Fig. 16 is a perspective view showing a conventional power supply device.
Fig. 17 is an exploded perspective view showing the power supply device of fig. 16.
Fig. 18 is a perspective view showing the separator of fig. 18.
Fig. 19 is a perspective view showing another example of the spacer.
Fig. 20 is a schematic horizontal sectional view showing a battery stack after expansion of the secondary battery cell in the power supply device of fig. 17.
Detailed Description
First, one aspect of the present invention will be described. As described in patent document 1, by allowing the secondary battery cell to expand, the load applied to the tie bars and the end plates during expansion can be reduced. However, the inventors have found that in the structure described in patent document 1, if the amount of swelling of the secondary battery cell increases, stress may concentrate on the end portion of the outer can of the secondary battery cell. Specifically, as shown in the schematic plan view of fig. 20, the end plates flex when the secondary battery cell 901 expands. The end plates are restrained from relative displacement by the lacing strips, but cannot maintain shape when the load is high. As a result, it has been found that, in the secondary battery cell restrained by the end plate or the tightening strip, the load can be reduced by allowing the expansion of the central portion of the outer can, but the expansion of the end portion of the outer can located near the tightening strip is suppressed, and therefore, the load may concentrate on the end portion of the outer can, and deformation or breakage may occur. On the other hand, the inventors have also found that, in the course of research, if the suppression of the swelling of the secondary battery cell is insufficient, the outer can may be damaged. In particular, the secondary battery cell has a structure including an outer can having an opening and a sealing plate for sealing the opening of the outer can, but if the outer can is excessively expanded, a load may be applied to a joint portion between the sealing plate and the outer can, and the joint portion may be broken. Based on the above findings, the inventors have found that, in order to reduce the load applied to the tie bars and the end plates during expansion and to prevent the breakage of the welded portion between the outer can and the sealing plate, it is important to configure the outer can to suppress the expansion near the sealing plate and allow the expansion of the battery cell in other portions, and have completed the present invention.
A power supply device according to an embodiment of the present invention includes a plurality of secondary battery cells in which an open end of a rectangular outer can having one open side is closed by a sealing plate, an insulating separator interposed between adjacent secondary battery cells, a pair of end plates covering both end surfaces of a battery stack formed by stacking the plurality of secondary battery cells, and a plurality of fastening members fastening the end plates to each other. In the power supply device, in a region where the separator is in contact with the secondary battery cell, a region on the sealing plate side is less likely to be deformed than other regions.
According to this configuration, the connection portion between the sealing plate and the outer can is protected when the secondary battery cell expands, and deformation of the outer can is allowed in other portions, whereby deformation during expansion can be alleviated.
In the power supply device according to an embodiment of the present invention, a region of the separator on the sealing plate side of the secondary battery cell protrudes from other regions. According to the above configuration, the portion of the separator that contacts the sealing plate side can be made to protrude, and deformation of the outer can be suppressed, so that the connecting portion between the sealing plate and the outer can be protected when the secondary battery cell expands.
In the power supply device according to another embodiment of the present invention, a region of the separator that is in contact with the secondary battery cell and is in contact with both side surfaces is formed lower than a region of the secondary battery cell on the side of the sealing plate. According to the above configuration, the separator has a low region in contact with the left and right side surfaces where stress is likely to concentrate when the secondary battery cell expands, and a space allowing deformation is formed, whereby stress can be relaxed and the secondary battery cell can be protected.
In the power supply device according to the other aspect of the present invention, in the separator, a region in contact with the secondary battery cell has flat surfaces formed to right and left end edges at a middle in a height direction, and a first protruding surface protruding from the flat surfaces and extending along the sealing plate is formed on the sealing plate side of the secondary battery cell in the region in contact with the secondary battery cell.
According to this configuration, the first projecting surface can suppress expansion near the sealing plate, and the region allowing expansion is defined to the left and right edges of the outer can at the middle in the height direction. In particular, by defining the expansion-allowable region to the left and right edges of the outer can, the deformation of the outer can is allowed to be opened with the ridge line of the outer can as a base point, and therefore, the expansion of the outer can is allowed while preventing the occurrence of stress concentration. For example, in the conventional structure exemplified in patent document 1, the expansion of the outer peripheral portion of the wide width of the outer can is suppressed and the expansion is allowed only in the central portion, and in this structure, the outer can is allowed to be deformed only by extension, and there is a risk that stress concentrates on a boundary portion between the pressed outer peripheral portion and the expansion-allowed central portion. According to the above embodiment, it is expected that the opening deformation is allowed in addition to the extension deformation, and the stress applied to the outer can be reduced.
The partition plate may have a second projecting surface extending parallel to the first projecting surface on the opposite side of the side on which the first projecting surface is provided, and the first projecting surface and the second projecting surface may be separated from each other.
The first protruding surface may be formed linearly along the sealing plate of the secondary battery cell.
The flat surface lower than the first projecting surface may be formed in a portion of the partition plate between an end edge of the partition plate in the extending direction of the first projecting surface and a side surface side end edge of the partition plate.
In the partition plate, a first stepped portion lower than the first projecting surface may be formed in a portion between a side surface of the first projecting surface in the longitudinal direction and an end edge of the partition plate. According to the above configuration, the following effects can be obtained: the stress concentration near the side surface of the outer can is avoided when the secondary battery cell expands, and the outer can is protected to improve the reliability.
A vehicle according to another embodiment of the present invention includes the power supply device, a traveling motor to which electric power is supplied from the power supply device, a vehicle body on which the power supply device and the motor are mounted, and wheels that are driven by the motor and run the vehicle body.
Embodiments of the present invention are described below with reference to the drawings. However, the embodiments described below are examples for embodying the technical idea of the present invention, and the present invention is not particularly limited to the embodiments described below. In addition, the present specification does not limit the members shown in the claims to the members of the embodiment in any way. In particular, the dimensions, materials, shapes, relative arrangements of the constituent members described in the embodiments, and the like are not intended to limit the scope of the present invention to these examples unless otherwise specified, but are merely illustrative examples. In addition, the sizes, positional relationships, and the like of the members shown in the drawings may be exaggerated for clarity of description. In the following description, the same names and reference numerals denote the same or substantially the same members, and detailed description thereof will be appropriately omitted. In addition, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and one member is used as a plurality of elements, or conversely, a function of one member may be shared by a plurality of members.
The power supply device according to the embodiment is used in various applications such as a power supply mounted on an electric vehicle such as a hybrid vehicle or an electric vehicle to supply electric power to a traveling motor, a power supply to store natural energy such as solar power generation or wind power generation, or a power supply to store midnight electric power, and is particularly used as a power supply suitable for applications of large electric power and large current.
[ embodiment 1]
Fig. 1 shows a perspective view of a power supply device 100 according to embodiment 1 of the present invention, fig. 2 shows an exploded perspective view thereof, and fig. 3 shows a vertical sectional view at the line III-III of fig. 1. The power supply device 100 shown in these figures includes: a plurality of secondary battery cells 1, the secondary battery cells 1 having positive and negative electrode terminals 2; and a bus bar 3 connected to the electrode terminals 2 of the plurality of secondary battery cells 1 to connect the plurality of secondary battery cells 1 in parallel and in series. The plurality of secondary battery cells 1 are connected in parallel and in series via the bus bar 3. The secondary battery cell 1 is a secondary battery that can be charged and discharged. In the power supply device 100, a plurality of secondary battery cells 1 are connected in parallel to constitute a parallel battery pack, and a plurality of parallel battery packs are connected in series, so that a large number of secondary battery cells 1 are connected in parallel and in series. In the power supply device 100 shown in fig. 1 to 3, a plurality of secondary battery cells 1 are stacked to form a battery stack 10. A pair of end plates 20 are disposed on both end surfaces of the cell stack 10. The end portions of the fastening members 30 are fixed to the end plates 20, thereby fixing the stacked secondary battery cells 1 in a pressed state.
(Secondary Battery cell 1)
The secondary battery cell 1 is a rectangular battery having a rectangular outer shape with a wide surface, i.e., a main surface, and has a thickness smaller than a width. The secondary battery cell 1 is a chargeable and dischargeable secondary battery, and is a lithium ion secondary battery. However, the secondary battery cell is not particularly limited to the rectangular battery in the present invention, and is not particularly limited to the lithium ion secondary battery. As the secondary battery cell, any battery that can be charged, for example, a nonaqueous electrolyte secondary battery other than a lithium ion secondary battery, a nickel hydride secondary battery cell, or the like may be used.
In the secondary battery cell 1, an electrode body in which positive and negative electrode plates are laminated is housed in an outer can 1a, and is sealed in an airtight manner while being filled with an electrolyte solution. As shown in fig. 2, the exterior can 1a is formed in a square tube shape with a closed bottom, and an upper opening thereof is hermetically closed by a sealing plate 1b which is a metal plate. The outer can 1a is produced by deep drawing a metal plate made of aluminum, aluminum alloy, or the like. The sealing plate 1b is made of a metal plate such as aluminum or aluminum alloy in the same manner as the outer can 1 a. The sealing plate 1b is inserted into the opening of the outer can 1a and laser light is irradiated to the boundary between the outer periphery of the sealing plate 1b and the inner periphery of the outer can 1a, whereby the sealing plate 1b is laser-welded to the outer can 1a and hermetically fixed.
(electrode terminal 2)
In the secondary battery cell 1, the sealing plate 1b, which is the top surface, is a terminal surface 1X, and positive and negative electrode terminals 2 are fixed to both end portions of the terminal surface 1X. The protruding portion of the electrode terminal 2 has a cylindrical shape. However, the protruding portion does not necessarily have to be cylindrical, and may be polygonal column-shaped or elliptical column-shaped.
The positive and negative electrode terminals 2 fixed to the sealing plate 1b of the secondary battery cell 1 are positioned so that the positive and negative electrodes are bilaterally symmetrical. Thus, the secondary battery cells 1 are stacked while being turned right and left, and the adjacent and close positive and negative electrode terminals 2 are connected by the bus bar 3, whereby the adjacent secondary battery cells 1 can be connected in series with each other.
(Battery laminate 10)
A plurality of secondary battery cells 1 are stacked such that the thickness direction of each secondary battery cell 1 is the stacking direction, thereby forming a battery stack 10. In the battery laminate 10, a plurality of secondary battery cells 1 are laminated such that a terminal surface 1X provided with positive and negative electrode terminals 2, i.e., a sealing plate 1b in fig. 2 to 3, is flush with each other.
(partition plate 40)
In the battery stack 10, the separators 40 are interposed between the adjacent and stacked secondary battery cells 1. The separator 40 is formed of an insulating material such as resin into a thin plate or sheet. The separator 40 has a plate shape having a size substantially equal to the size of the surface of the secondary battery cell 1 facing each other. The separators 40 are stacked between the adjacent secondary battery cells 1 to insulate the adjacent secondary battery cells 1 from each other.
In the power supply device 100 shown in fig. 2 to 3, the end plates 20 are disposed on both end surfaces of the battery stack 10. Further, the end separator 40' may be interposed between the end plate and the cell laminate to insulate them. The end-face separator 40' may be formed of an insulating material such as resin into a thin plate or sheet.
(bus bar 3)
In the battery stack 10, a metal bus bar 3 is connected to the positive and negative electrode terminals 2 of the adjacent secondary battery cells 1, and the plurality of secondary battery cells 1 are connected in parallel and in series via the bus bar 3. In the power supply device 100 of embodiment 1, in the battery stack 10 in which the plurality of secondary battery cells 1 are stacked on each other, the electrode terminals 2 of the plurality of secondary battery cells 1 adjacent to each other are connected to each other by the bus bar 3, and the plurality of secondary battery cells 1 are connected in parallel and in series.
The metal plate is cut and processed to manufacture the bus bar 3 into a predetermined shape. As the metal plate constituting the bus bar 3, a metal having a small electric resistance and a light weight, such as an aluminum plate, a copper plate, or an alloy thereof, can be used. However, other metals having a small electric resistance and a light weight, and alloys thereof can be used as the metal plate of the bus bar 3. Further, a bus bar holder may be disposed between the battery stack 10 and the bus bar 3. By using the bus bar holder, the plurality of bus bars can be insulated from each other and the terminal surfaces of the secondary battery cells can be insulated from the bus bars, and the plurality of bus bars can be arranged at fixed positions on the upper surface of the battery stack.
(end plate 20)
As shown in fig. 1 to 3, the end plates 20 are disposed at both ends of the cell stack 10 and are fastened by fastening members 30 disposed along both side surfaces of the cell stack 10. The end plates 20 are disposed at both ends of the battery stack 10 in the stacking direction of the secondary battery cells 1 and outside the end face separators 40' so as to sandwich the battery stack 10 from both ends.
(end face partition 40')
The end-face separator 40' is different from the normal separator 40 in that it is interposed not between the secondary battery cells 1 but between the end plate 20 and the secondary battery cell 1. Since the end plate 20 does not need to take into account the expansion of the secondary battery cell 1, the entire surface of the end-face separator 40' facing the end plate 20 can be formed into a flat second flat surface without forming the first projecting surface 45 or the like. On the other hand, the other surface of the end-face separator 40', that is, the surface facing the secondary battery cell 1, is formed with a first projecting surface 45 and a flat surface 43 in the same manner as the separator 40 described above. However, the above-described separator 40 may be used as an end separator as it is.
(fastening member 30)
As shown in fig. 1 and 2, the fastening members 30 extend in the stacking direction of the cell stack 10, and both ends thereof are fixed to the end plates 20 disposed on both end surfaces of the cell stack 10, and the cell stack 10 is fastened in the stacking direction by the end plates 20. The fastening member 30 is a metal plate having a predetermined width and a predetermined thickness along the side surfaces of the cell laminate 10, and is disposed so as to face the both side surfaces of the cell laminate 10. As the fastening member 30, a metal plate such as iron can be used, and a steel plate is preferably used. The fastening member 30 formed of a metal plate is formed into a predetermined shape by bending processing such as press forming.
The two fastening members 30 are disposed on the left and right side surfaces of the battery stack 10 so as to be vertically separated from each other. Each fastening member 30 includes a body portion 31 arranged along the side surface of the cell stack 10, and fixing portions 32 bent at both ends of the body portion 31 and fixed to the outer side surfaces of the end plates 20. The body portion 31 is formed in a belt shape having a length substantially equal to the length of the battery stack 10. The fastening member 30 is formed as a fixing portion 32 by bending both end portions thereof so as to extend along the outer side surfaces of the end plates 20 in order to fix both end portions thereof to the pair of end plates 20. The fastening member 30 is fixed to the end plate 20 by a fixing piece 34 inserted into a through hole 33 provided at the distal end of the fixing portion 32.
In the example of fig. 2 and the like, two fastening members 30 are disposed on each of the left and right side surfaces of the battery stack 10 so as to be vertically separated. However, in the present invention, the number of the fastening members is not limited to this configuration, and 3 or more or one fastening member may be disposed on the side surface of the cell stack. One fastening member can be formed to a size that substantially covers the side surface of the battery laminate. Further, an opening may be formed in the middle of the fastening member as needed. The fastening members may be disposed on the upper and lower surfaces of the cell stack, in addition to the left and right sides of the cell stack.
(details of the partition 40)
In the power supply device 100, the degree of ease of deformation, i.e., the ease of deformation, is made lower in the region where the separator 40 contacts the secondary battery cell 1, particularly, in the region where the sealing plate 1b of the secondary battery cell 1 contacts the separator 40, than in other regions. This can protect the connection portion between the sealing plate 1b and the outer can 1a when the secondary battery cell 1 swells, and can allow deformation of the outer can 1a at other portions, thereby alleviating deformation during swelling.
In the secondary battery cell, it is known that the electrode body housed inside the outer can expands due to charging and discharging and pushes out the outer can from the inner surface, and as a result, the outer can expands. In particular, in recent years, the demand for higher battery capacity has been increasing, and the amount of swelling has also tended to increase with this demand. In a battery laminate in which a large number of secondary battery cells are laminated, the overall swelling amount also increases in accordance with the number of cells.
On the other hand, in the battery laminate, in a state in which the secondary battery cells and the separators are alternately laminated, end plates are arranged on both end surfaces and fastened by fastening members such as a fastening band. The terminal plates are fastened by the fastening members in a state of being strongly sandwiched therebetween, whereby the secondary battery cells can be prevented from being displaced vertically or falling off.
In this state, when the secondary battery cell expands, as shown in fig. 20, the middle portion of the end plate 920 located at the end face is pushed out by the secondary battery cell 901, while both ends thereof are pulled by the tightening strip 930, resulting in a state of being bent into an arcuate shape (the amount of deformation is highlighted for explanation in fig. 20). As a result, the corner of the end edge of end plate 920 is bent to protrude toward secondary battery cell 901, and as a result, the end edge of secondary battery cell 901 is strongly pressed. In this state, strong stress is concentrated on the side surfaces of the secondary battery cell 901. In order to prevent such a situation, it is necessary to have a structure capable of absorbing deformation so that stress is not concentrated on a specific portion during expansion.
On the other hand, if the outer can of the secondary battery cell swells, there is a risk that the welded portion between the outer can and the sealing plate will fall off. That is, generally, the upper surface of a rectangular outer can of a secondary battery cell is opened, a current collector or the like is introduced from the opened upper surface, the opened upper surface is sealed with a sealing plate, and the joint interface is welded by laser welding or the like.
However, if the outer can is repeatedly expanded, there is a risk that the laser-welded portion between the opening end surface of the outer can and the sealing plate will break. In order to prevent such a situation, it is necessary to protect the portion so that the joint interface of the outer can and the sealing plate does not separate. This means is a means for preventing or limiting the expansion of the outer can, and is the opposite of the above-described method for allowing deformation.
As described above, the power supply device is required to have contradictory properties of allowing deformation and restricting deformation, and it is not easy to achieve both of them. In contrast, in the power supply device 100 of the present embodiment, a structure is adopted in which the degree of ease of deformation, i.e., the ease of deformation, of the contact portion between the separator 40 and the secondary battery cell 1 is locally changed, that is, the rigidity is not uniform.
Specifically, fig. 4 shows a perspective view of the separator 40 of embodiment 1. The separator 40 shown in the figure has a main surface portion 41 constituting a main surface, and guide portions 42 formed on both side surfaces of the main surface portion 41.
The guide portion 42 is formed in a wall shape protruding toward the front and back of the main surface portion 41 on the side surface of the main surface portion 41. The guide portions 42 are formed so as to cover the side surfaces of the secondary battery cell 1 with the guide portions 42 of the separators 40 respectively disposed on the front and back surfaces of the secondary battery cell 1 when the secondary battery cell 1 and the separators 40 are alternately stacked.
The main surface portion 41 is formed with a flat surface 43 and projecting surfaces 44 formed vertically. In the example of fig. 4, the projection surface 44 includes a first projection surface 45 formed on the upper side of the main surface portion 41 and a second projection surface 46 formed on the lower side. The first projection surface 45 and the second projection surface 46 are formed in a bar shape extending in the lateral direction, slightly projecting from the flat portion. The projection amount of the projection surface is, for example, 0.05mm to 1mm, preferably 0.1mm to 0.8mm, and more preferably about 0.6 mm. The first projection surface 45 and the second projection surface 46 are preferably formed integrally with the partition plate 40.
The separator 40 is made of a material having excellent insulation properties and heat resistance. It is preferable that the polycarbonate resin can be mass-produced inexpensively from engineering plastics such as a polycarbonate resin and a PBT resin. Alternatively, the resin composition may be made of a resin having excellent heat resistance, a thermoplastic resin such as PPS, polypropylene, nylon, PET, polyvinylidene chloride, and polyvinylidene fluoride, or a thermosetting resin such as polyimide, fluororesin, PDAP, silicone resin, and epoxy resin.
As shown in the vertical cross-sectional view of fig. 3, the first projecting surface 45 is provided so as to overlap with or be located near the portion of the secondary battery cell 1 to which the sealing plate 1b is joined.
(first step 47)
On the other hand, the first projecting surface 45 has a first stepped portion 47 formed between its longitudinal side surface and the upper surface side end edge of the partition 40. In other words, the first protruding surface 45 is not extended to the guide portion 42, but the first stepped portion 47 is lower than the first protruding surface 45, thereby forming a space between the separator 40 and the secondary battery cell 1. In the example of fig. 4, the flat surface 43 of the main surface portion 41 is continuous to the left and right of the first projecting surface 45. This can avoid concentration of stress near the side surface of the outer can 1a when the secondary battery cell 1 expands, and can protect the outer can 1a to improve reliability.
That is, as shown in the horizontal cross-sectional view of fig. 20, when the secondary battery cell 1 swells, the abdomen portion of the outer can 1a protrudes, and as a result, the following state is achieved: as a reaction to the bending of the adjacent other secondary battery cell and end plate 920, the corner of the other secondary battery cell and end plate 920 protrudes toward the secondary battery cell 901. In other words, the corners of the expanded secondary battery cell 901 are pressed from the surroundings, and stress may concentrate on the corners and the outer can 1a may be damaged. Therefore, in the present embodiment, as described above, the first projecting surface 45 is formed and the first stepped portions 47 are formed on the left and right sides thereof. As a result, as shown in the horizontal cross-sectional view of fig. 5, the stress concentration on the corner of the outer can 1a is alleviated, and the secondary battery cell 1 can be protected.
[ embodiment 2]
The width d1 of the first stepped portion 47 is designed according to an assumed amount of expansion of the outer tank, a material (plasticity) of the outer tank, and the like. Preferably, the secondary battery cell 1 having a larger deformation amount is set to be larger. For example, the width W of the partition 40 is set to, for example, 0.05 W.ltoreq.d 1.ltoreq.0.3W, preferably 0.1 W.ltoreq.d 1.ltoreq.0.2W. Fig. 6 shows a partition 40B of the power supply device of embodiment 2. In this separator 40B, the width d2 of the first stepped portion 47 is made wider than that in embodiment 1, and the secondary battery cell 1 having a larger amount of deformation can be handled than that in embodiment 1.
(second projection surface 46)
In the above example, the second projecting surface 46 is provided on the bottom surface side of the partition plate 40 in addition to the first projecting surface 45, whereby not only the opening end side of the outer can 1a to which the sealing plate 1b is welded but also the bottom plate side can be protected. The second projection surface 46 is preferably designed to have the same projection height as the first projection surface 45. The width of the second projecting surface 46, in other words, the width of the second stepped portion formed on the left and right of the second projecting surface 46, can be set to the same size as the first projecting surface 45. However, the second projecting surface 46 may have a projecting height and a projecting length different from those of the first projecting surface 45 depending on the secondary battery cell 1.
[ embodiment 3]
On the other hand, the risk of the bottom surface side of the exterior can 1a integrally formed by drawing or the like being broken is lower than the risk of fatigue breakage of the sealing plate 1 b. From such a viewpoint, the second projecting surface may be omitted. Fig. 7 is a perspective view showing such an example as a partition 40C of the power supply device of embodiment 3. In the separator 40C shown in the figure, only the first projecting surface 45 is provided on the upper side of the flat surface 43 of the main surface portion 41, and the second projecting surface is not provided on the lower side. The use of such a separator 40C can effectively prevent the breakage of the welded portion of the sealing plate 1 b.
[ embodiment 4]
In addition, in the configuration in which only the first projecting surface 45 is provided as described above, it is needless to say that the width d1 of the first projecting surface 45 can be appropriately adjusted as described above. As an example, fig. 8 shows an example in which the width of the first protruding surface 45 is shortened to D2 as the partition 40D of the power supply device of embodiment 4.
[ embodiment 5]
The first projecting surface 45 is not necessarily provided along the upper end of the separator 40, and the position at which the first projecting surface is provided can be arbitrarily adjusted according to the size and position of the secondary battery cell with which the separator is in contact. That is, the shape of the separator may be larger than that of the secondary battery cell, and the first projecting surface is not necessarily fixed to the upper end of the separator. When the secondary battery cell and the separator are stacked, the first projecting surface is disposed in the region where the sealing plate is located and in the vicinity thereof, thereby protecting the fixed portion of the sealing plate. As an example, fig. 9 is a perspective view showing a partition 40E of a power supply device according to embodiment 5. In this example, the first projecting surface 45 is provided at a position slightly distant from the upper end of the flat surface 43 of the main surface portion 41. In this way, the arrangement position of the first protruding surface is determined according to the shape and size of the secondary battery cell and the separator, and the sealing plate can be effectively protected.
[ embodiment 6]
In the above example, the first projecting surface 45 is provided in the vicinity of the sealing plate 1b in order to protect the welded portion between the outer can 1a and the sealing plate 1 b. However, the present invention is not limited to this configuration, and the first projecting surface may be disposed at a position above the current collector causing expansion in the secondary battery cell or in the vicinity thereof. Such an example will be described with reference to fig. 10A to 10B. As shown in these figures, the secondary battery cell 1 swells due to the current collector 1c housed inside the exterior can 1a swelling due to charging and discharging. Therefore, by positioning the first projecting surface 45 in correspondence with the upper portion of the current collector 1c, deformation of the secondary battery cell at that portion can be suppressed, and fatigue failure due to deformation of the welded portion of the sealing plate 1b above that portion can be suppressed.
[ embodiment 7]
In the above example, the first projecting surface 45 and the second projecting surface 46 are integrally formed with the partition plate 40. However, the present invention is not limited to the structure in which the first projecting surface, the second projecting surface, and the partition plate are integrally formed, and these portions may be constituted by separate members. For example, fig. 11 is a perspective view showing a partition 40F of a power supply device according to embodiment 7. In this example, a first projection surface 45F is bonded to an upper portion of a partition plate 40F formed of a flat main surface portion 41. The first projecting surface 45F is formed in advance of a resin plate, sheet, or the like, and is fixed to the partition plate 40F by a double-sided tape, adhesion, or the like. Alternatively, the adhesive may be applied in advance to the back surface side of the first projecting surface 45F. A heat-resistant and insulating tape material itself may be attached to the separator 40F to serve as the first projecting surface 45F. With this configuration, the first projecting surface having a desired length can be attached to an appropriate position by using an existing separator, thereby providing a tolerance function when the secondary battery cell expands.
[ embodiment 8]
In the above example, the ease of deformation of the region where the separator 40 and the sealing plate 1b of the secondary battery cell are in contact with each other is adjusted on the separator 40 side. However, the present invention is not limited to this configuration, and may be configured to adjust the ease of deformation of the region where the separator and the sealing plate side of the secondary battery cell are in contact with each other on the secondary battery cell side. Fig. 12 is an exploded perspective view showing such an example as a battery stack of a power supply device of embodiment 8. In the battery laminate shown in the figure, the first protruding surface 45G is attached to the surface of the outer can 1a of the secondary battery cell 1. According to this configuration, the following effects can be obtained: the first projecting surface 45G interposed in the region where the separator 40G contacts the sealing plate 1b side of the secondary battery cell 1 suppresses the amount of deformation of the secondary battery cell 1 during expansion, thereby protecting the connection portion of the sealing plate 1 b.
In the above example, the configuration in which the first projecting surface 45 is added so that the deformation easiness of the region where the separator 40 contacts the sealing plate 1b side of the secondary battery cell 1 is relatively lower than that of the other region has been described, but the deformation easiness may be adjusted not by the shape but by the material difference. For example, the same effect can be achieved by forming the material of the separator from a composite material, making the hardness high on the seal plate side and making the hardness low in the other regions. For example, by combining a plurality of members having different materials, that is, different hardnesses to form the separator, such a structure that locally differs in hardness can be provided.
The power supply device described above can be used as a power supply for a vehicle. As a vehicle on which the power supply device is mounted, an electric vehicle such as a hybrid vehicle that runs by both an engine and a motor, a plug-in hybrid vehicle, or an electric vehicle that runs by only a motor can be used, and the power supply device can be used as a power supply for these vehicles. An example in which a power supply device 100 having a large capacity and a high output is constructed in which a plurality of the above-described power supply devices are connected in series or in parallel to obtain electric power for driving a vehicle and a necessary control circuit is further added will be described.
(Power supply device for hybrid vehicle)
Fig. 13 shows an example of a power supply device mounted on a hybrid vehicle that travels by both an engine and a motor. The vehicle HV having the power supply device mounted thereon shown in this figure includes a vehicle main body 91, an engine 96 and a traveling motor 93 for causing the vehicle main body 91 to travel, wheels 97 driven by the engine 96 and the traveling motor 93, a power supply device 100 for supplying electric power to the motor 93, and a generator 94 for charging a battery of the power supply device 100. The power supply device 100 is connected to the motor 93 and the generator 94 via a DC/AC inverter 95. The vehicle HV travels by both the motor 93 and the engine 96 while charging and discharging the battery of the power supply device 100. The electric motor 93 is driven to run the vehicle in a region where the engine efficiency is low, for example, at the time of acceleration or at the time of low-speed running. The motor 93 is driven by power supplied from the power supply device 100. The generator 94 is driven by the engine 96 or by regenerative braking when braking the vehicle, thereby charging the battery of the power supply device 100. As shown in fig. 13, the vehicle HV may also have a charging plug 98 for charging the power supply device 100. The power supply device 100 can be charged by connecting the charging plug 98 to an external power supply.
(Power supply device for electric vehicle)
Fig. 14 shows an example of a power supply device mounted on an electric vehicle that travels only by a motor. The vehicle EV shown in the figure, which is equipped with a power supply device, includes a vehicle main body 91, a traveling motor 93 for traveling the vehicle main body 91, wheels 97 driven by the motor 93, a power supply device 100 for supplying electric power to the motor 93, and a generator 94 for charging a battery of the power supply device 100. The power supply device 100 is connected to the motor 93 and the generator 94 via a DC/AC inverter 95. The motor 93 is driven by power supplied from the power supply device 100. The generator 94 is driven by energy at the time of regenerative braking of the vehicle EV to charge the battery of the power supply device 100. Vehicle EV has a charging plug 98, and power supply device 100 can be charged by connecting charging plug 98 to an external power supply.
(electric storage System)
The present invention is not limited to the application of the power supply device, particularly, to the power supply of the motor for running the vehicle. The power supply device according to each embodiment may be used as a power supply of an electric storage system that charges and stores a battery with electric power generated by solar power generation, wind power generation, or the like. Fig. 15 shows an electricity storage system in which a battery of the power supply device 100 is charged with a solar battery and stored. As shown in the drawing, the power storage system shown in the drawing charges the battery of the power supply device 100 with electric power generated by the solar battery 82 disposed on the roof, the room, or the like of the building 81 such as a house or a factory. The power storage system supplies the electric power stored in the power supply device 100 to the load 83 via the DC/AC inverter 85.
Although not shown, the power supply device may be used as a power supply of an electric storage system that charges and stores a battery with midnight electric power. A power supply device that is charged by midnight power, which is surplus power of a power station, and outputs power in the daytime when a power load is large, so that peak power in the daytime can be limited to be small. The power supply device may be used as a power supply for charging both the output of the solar cell and the midnight power. The power supply device can effectively use both the power generated by the solar cell and the midnight power, and can efficiently store power while taking weather and power consumption into consideration.
The power storage system as described above can be suitably applied to applications such as a backup power supply device which can be mounted on a rack of a computer server, a backup power supply device for a wireless base station such as a mobile phone, a power supply for power storage for home use or factory use, a power supply for street lamps, a power storage device which is a combination of a solar cell and the like, a backup power supply for traffic lights, a traffic display for roads, and the like.
Industrial applicability
The power supply device and the vehicle having the power supply device of the present invention can be preferably used as a power supply for large current used as a power supply for a motor or the like for driving an electric vehicle such as a hybrid vehicle, a fuel cell vehicle, an electric vehicle, or an electric motorcycle. Examples of the power supply device include a plug-in hybrid electric vehicle, a hybrid electric vehicle, and an electric vehicle that can switch between an EV running mode and an HEV running mode. Further, the present invention can be suitably applied to applications such as a backup power supply device mountable on a rack of a computer server, a backup power supply device for a wireless base station such as a mobile phone, a power storage device combined with a solar battery such as a power supply for home use and factory use, a power supply for a street lamp, and a backup power supply for a traffic light.
Description of the reference numerals
100. A power supply device; 1. a secondary battery cell; 1X, terminal surface; 1a, an outer can; 1b, a sealing plate; 1c, a current collector; 2. an electrode terminal; 3. a bus bar; 10. a battery laminate; 20. an end plate; 30. a fastening member; 31. a main body portion; 32. a fixed part; 33. a through hole; 34. a fixing member; 40. 40B, 40C, 40D, 40E, 40F, 40G, a separator; 40', end face spacers; 41. a main surface portion; 42. a guide section; 43. a flat surface; 44. a protruding surface; 45. 45F, 45G, a first protruding surface; 46. a second projection surface; 47. a first step portion; 81. a building; 82. a solar cell; 83. a load; 85. a DC/AC inverter; 91. a vehicle main body; 93. an electric motor; 94. a generator; 95. a DC/AC inverter; 96. an engine; 97. a wheel; 98. a charging plug; 900. a power supply device; 901. a secondary battery cell; 910. a battery laminate; 920. an end plate; 930. tightening the strip; 940. 940', a separator; 941. a recessed portion; HV, vehicle; EV, vehicle.

Claims (8)

1. A power supply device having a plurality of secondary battery cells in which an open end of a rectangular outer can having one open side is closed by a sealing plate, an insulating separator interposed between adjacent secondary battery cells, a pair of end plates covering both end surfaces of a battery laminate formed by laminating the plurality of secondary battery cells, and a plurality of fastening members fastening the end plates to each other,
in a region where the separator is in contact with the secondary battery cell, a region where the separator is in contact with a sealing plate of the secondary battery cell is less easily deformed than other regions,
in the separator, a region in contact with both side surfaces of a region in contact with the secondary battery cell is formed lower than a region in contact with a sealing plate of the secondary battery cell.
2. The power supply device according to claim 1,
in the separator, a region in contact with the sealing plate of the secondary battery cell protrudes from other regions.
3. The power supply device according to claim 1 or 2,
in the above-mentioned separator, the separator is,
a region in contact with the secondary battery cell has flat surfaces formed to right and left edges at a middle in a height direction,
the region in contact with the single secondary battery is formed with a first protruding surface that protrudes beyond the flat surface and extends along the sealing plate on the side in contact with the sealing plate of the single secondary battery.
4. The power supply device according to claim 3,
the partition plate has a second projecting surface extending parallel to the first projecting surface on the side opposite to the side on which the first projecting surface is provided,
the first projection surface and the second projection surface are spaced apart.
5. The power supply device according to claim 3,
the first protruding surface is formed linearly along the sealing plate of the secondary battery cell.
6. The power supply device according to claim 3,
the flat surface lower than the first protruding surface is formed in a portion of the separator between an end edge of the separator in the extending direction of the first protruding surface and an end edge on the side surface side of the separator.
7. The power supply device according to claim 3,
a first stepped portion lower than the first projecting surface is formed in a portion of the partition plate between a side surface of the first projecting surface in the longitudinal direction and an end edge of the partition plate.
8. A vehicle having the power supply device according to any one of claims 1 to 7,
the vehicle includes the power supply device, a motor for traveling to which electric power is supplied from the power supply device, a vehicle body on which the power supply device and the motor are mounted, and wheels that are driven by the motor to travel on the vehicle body.
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US11962026B2 (en) 2024-04-16
WO2020031737A1 (en) 2020-02-13
US20210320367A1 (en) 2021-10-14
JP7296967B2 (en) 2023-06-23

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